在ext\resources\css目录下，编辑ext-all.css文件，文件首部：
html,body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,p,blockquote,th,td{margin:0;padding:0;}img,body,html{border:0;}address,caption,cite,code,dfn,em,strong,th,var{font-style:normal;font-weight:normal;}ol,ul {list-style:none;}caption,th {text-align:left;}h1,h2,h3,h4,h5,h6{font-size:100%;}q:before,q:after{content:'';}.ext-el-mask {
z-index: 100;
position: absolute;
top:0;
left:0;
-moz-opacity: 0.5;
opacity: 0;
filter: alpha(opacity=0);
width: 100%;
height: 100%;
zoom: 1;
}
将原来的值0.50和50改为0，在火狐和IE下就都变成透明的了。
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